Triphenylphosphine → 4-{2-[4-(5-Amino-3-tert-butyl-pyrazol-1-yl)-phenoxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a solution of 4-(5-amino-3-tert-butyl-pyrazol-1-yl)-phenol (550 mg, 2.4 mmol) and 4-(2-hydroxy-ethyl)-piperidine-1-carboxylic acid tert-butyl ester (505 mg, 2.18 mmol) in 50 mL THF was added ADDP (825 mg, 3.28 mmol) and triphenylphosphine (858 mg, 3.28 mmol). The reaction mixture was stirred at room temperature under nitrogen overnight. The solid was removed by filtration, the filtrate was concentrated and the residue was purified by MPLC (80:20 hexane/EtOAc) to give the desired product 4-{2-[4-(5-amino-3-tert-butyl-pyrazol-1-yl)-phenoxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester 800 mg (83%). 1H-NMR (DMSO-d6) δ 7.40 (d, 2H), 7.00 (d, 2H), 5.35 (s, 1H), 5.0 (s, 2H), 4.0 (m, 2H), 3.90 (m, 2H), 1.70-1.60 (m, 6H), 1.40 (s, 9H), 1.20 (s, 9H), 1.05 (m, 1H); MS LC-MS [M+H]+=443.3, RT=3.10 min.

Provenance & Evidence